How to convince my friend he is being catfished?

I need some advice. I have a friend who is "dating" this "girl" who claims to be a Russian singer and actress. However if you look on her Facebook profile there are no pictures of her except for like modeling photos and photos from the internet. Plus she only has about 40 something friends and most of them are males. He met her on xbox live and he says that when he asks her to Skype with him she never lets him see her face. She says its because she doesn't want to expose her self because she is famous. She also has all of these unbelievably sad personal stories. None of which I can find any reference to on the internet when I google the person she is supposed to be. She also says she is 26 and has 7 kids. I can find no record of that person having any kids. Everyone except for my friend is sure that she is a catfisher. So my question is: How do we convince him that he is being catfished? Everytime we try to he has an excuse for her. Any advice would be helpful. thanks.
How to convince my friend he is being catfished?
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